﻿////////////////////////////////////////////////////////////////////////////////////////
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING THIS SOFTWARE
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install, copy or use the software.
//
// Copyright (C) 2013, AerVision Technologies Pty Ltd, all rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of AerVision Technologies, may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors to demonstrate 
// www.AerCloud.net Framework as a Service API (FaaS), "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the copyright holder or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
////////////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace App_AerCloudDemo.Utils
{
    public class MessageLogger
    {
        FileStream stream = null;
        TextWriter textWriter = null;

        public delegate void MessageLogEventHandler(string message);
        public event MessageLogEventHandler MessageLogged = null;

        private static MessageLogger myLogger = null;
        public static MessageLogger Default
        {
            get
            {
                if (myLogger == null)
                    myLogger = new MessageLogger();

                return myLogger;
            }
        }

        public MessageLogger()
        {
            string fileName = System.Reflection.Assembly.GetEntryAssembly().Location + ".log";

            try
            {
                stream = new FileStream(fileName, FileMode.Append,
                    FileAccess.Write, FileShare.Read);

                textWriter = new StreamWriter(stream);
            }
            catch (System.IO.IOException e)
            {
                stream = null;
                textWriter = null;
                WriteLineWithTime(String.Format("Error: Couldn't create log file {0}: {1}", fileName, e.Message));
            }
        }

        public void WriteLineWithTime(string line)
        {
            line = line.Trim();

            if (textWriter != null)
            {
                lock (textWriter)
                {
                    textWriter.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff> ") + line);
                }

                textWriter.Flush();
            }

            if (MessageLogged != null)
                MessageLogged(DateTime.Now.ToString("hh:mm:ss tt | ") + line);
        }
    }
}